Sizing a Mill
Sizing a Lathe
#1 Advantage of
Magnetic Scales

#2 Advantage of
Magnetic Scales
Installing a Mill
Kit - Part 1 of 4
Installing a Mill
Kit - Part 2 of 4
Installing a Mill
Kit - Part 3 of 4
Installing a Mill
Kit - Part 4 of 4
Installing a Lathe
Kit - Part 1 of 4
Installing a Lathe
Kit - Part 2 of 4
Installing a Lathe
Kit - Part 3 of 4
Installing a Lathe
Kit - Part 4 of 4
EL400 Display Overview
EL700 Display
Part 1 of 4
EL700 Display
Part 2 of 4
EL700 Display
Part 3 of 4
DRO PROS Intro Video
ARC Machining
Incline Tool Position
ES10 Overview
Sub Datum Memory
Line Hole Position
Bolt Hole Circle
Parameters Setup
Choosing Your Scales
Power Off Memory
Center Find Function
Changing Scale Direction



Order Line & Tech Help - Call now 1-707-452-8434

We speak English - We answer our phones - Lifetime Warranty on magnetic kits!

Magnetic Scales cannot be broken - Coolant & Dust Proof - Cut to length

NOTE: Items are shown out of their protective boxes to better illustrate what's included.

Display cover, and installation instructions included but not shown.

All kits ship in original factory packaging and boxes.

Magnetic Scales can be easily cut to length and can't be contaminated!


Help on determining Magnetic Scale Length:

Magnetic scales are named according to the amount of travel the scales are built to accommodate. This is the value you should use to match the travel of your machine. As a sidenote, maximum travel will be ~ 5/8" longer, and overall length will be 5-1/2" longer than stated scale size. Using a 12" scale as an example, it is designed to fully accommodate 12" of travel, it's maximum travel will be 12-5/8", and overall length will be 17-1/2".

We currently carry three different types of magnetic scales - the S1 Scale, the S2 Scale, and the J2 Scale:

Magnetic Scales
Scale Length Scale Type Jointed? Trolley?
6" - 40" S1 No No
60 - 80" S2 No No
80" - 240" J2 Yes Yes


S1 Scale. Magnetic scales up to 40" long are built from a single, thin piece of extrusion called the S1. The readhead is mounted separately above the scale (readhead shown in position on the track but is never connected to the scale)

S1 Scale

6 - 40"



S2 Scale. Magnetic scales longer than 40" long are built from a thicker extrusion called the S2. Depending on the length of the scale, they can either be a single piece, or jointed where several lengths assemble together to form a much longer, continuous scale (similar to a "hot wheels" track).

S2 Scale

60 - 80"



The J2 Scale is a jointed scale technology where the scale is comprised of several segments. The pieces are easily joined together with included dowels. The readhead is held in position by a trolley assembly, which is self guided as it travels the length of the scale. The trolley holds the readhead in perfect alignment in relation to the scale.  This makes installation a much easier task, as the moving surface of the machine need not be in perfect alignment for the scale to function correctly. Additional benefits to the jointed scales are reduced shipping costs, easier installation, and increased durability.

J2 Scale

80 - 240"



Available Magnetic Scales:

(Remember, magnetic scales can be easily cut to length or shortened)

Magnetic Scales
Scale Designation  Scale Travel Scale Type Resolution Scale Sections Jointed? Trolley?
6" 5µm  6" S1 0.0002" 1 No No
8" 1µm 8" S1 0.00005" 1 No No
8" 5µm 8" S1 0.0002" 1 No No
10" 1µm  10" S1 0.00005" 1 No No
10" 5µm  10" S1 0.0002" 1 No No
12" 1µm  12" S1 0.00005" 1 No No
12" 5µm 12" S1 0.0002" 1 No No
14" 1µm 14" S1 0.00005" 1 No No
14" 5µm 14" S1 0.0002" 1 No No
16" 1µm 16" S1 0.00005" 1 No No
16" 5µm 16" S1 0.0002" 1 No No
18" 5µm 18" S1 0.0002" 1 No No
20" 1µm 20" S1 0.00005" 1 No No
20" 5µm 20" S1 0.0002" 1 No No
22" 1µm 22" S1 0.00005" 1 No No
22" 5µm 22" S1 0.0002" 1 No No
30" 5µm 30" S1 0.0002" 1 No No
36" 5µm 36" S1 0.0002" 1 No No
40" 5µm 40" S1 0.0002" 1 No No
60" 5µm  60" S2 0.0002" 1 No No
80" 5µm 80" S2 0.0002" 1 No No
80" 5µm 80" S2 0.0002" 3 Yes Yes
110" 5µm 110" S2 0.0002" 3 Yes Yes
120" 5µm  120" S2 0.0002" 3 Yes Yes
160" 5µm 160" S2 0.0002" 3 Yes Yes
200" 5µm  200" S2 0.0002" 3 Yes Yes
240" 5µm 240" S2 0.0002" 4 Yes Yes


Electronica Magnetic Scale Technical Specifications:

Pole Pitch 1mm/2mm
Resolutions (X4 edge) 1µm , 5µm
Accuracy (µ/m) ±10µ, ±10µ
Repeat accuracy ± 1 count


Measuring Lengths

6" (152mm), 8" (203mm), 10" (254mm), 12" (305mm), 14" (356mm), 16" (406mm), 18" (457mm), 20" (508mm), 22" (559mm), 30" (762mm), 40" (1,016mm), 60" (1,524mm), 80" (2,032mm), 120" (3,048mm), 160" (4,064mm), 200" (5,080mm), 240" (6,096mm)
Current consumption Typ. 150mA (250mA max)
Power supply + 5 VDC (± 5%)
Output signal

Differential Line driver as per EIA RS422 standards. 1Vp-p Sine wave output. (0.6Vp-p – 1.2Vp-p)

Reference mark Every 50mm
Operating Temperature 0ºC  to 50ºC
Storage Temperature -20ºC to 70ºC
Relative Humidity

20% to 80%


Standard Cable length 5 meters armoured
Max. cable length 20 meters

Measurement Speed 1Vpp

2MHz (10m/s @ 5µm)

1Vp-p – 10KHz

Protection class IP-67



Pin 1 2 3 4 5 6 7 8 9
Signal + Z - Z VCC Shield GND + A - A - B + B
Color Grey Brown Black Violet White Pink Red Green Yellow



Pin 1 2 3 4 5 6 7 8 9
Signal V0+ V0- VCC Shield GND V1+ V1- V2- V2+
Color Grey Brown Black Violet White Pink Red Green Yellow



Benefits of Magnetic Scales

  Magnetic Scales Glass Scales Inductive Scales
Profile 1-1/4" height 2-1/8" height 2-7/8" height
Ease of installation Flat scale "bar" easily mounts directly to machine Scale and readhead joined together ? cannot be disassembled Round "bar" must be offset / cannot be mounted flat against the machine
Price Complete kit starts at only $760 ~ $700 $1,500 +
Cost to repair Readhead and / or scale can be purchased separately Readhead and scale must be purchased as a complete assembly Parts extremely expensive
Resistance to contaminants Impervious to contaminants Optical technology susceptible to contamination Impervious to contaminants
Can scales be cut  to a custom length? Yes No No
Scale durability Virtually indestructible Glass prone to breakage, contamination Rod susceptible to damage
Overall length 2.5" longer than travel 5" longer than travel 10" longer than travel
Upgradeable software Convenient USB Not available Not available
Bracket system Powder coated black, custom brackets  "Universal brackets" require extensive modification Complicated bracket system must be "offset"

There are currently three different scale types available for digital readout systems. They are magnetic, glass, and inductive. Glass scales rely upon an optical encoder and receiver mounted inside of an aluminum extrusion. If the scale becomes contaminated by coolant, oil or dust, they are rendered useless.

Inductive scales are impervious to contamination. The disadvantages are they're bulky, expensive, and difficult to mount.

Magnetic scales combine the best of optical and inductive technology. Magnetic scales are impervious to coolant, liquid or dust, yet are slimmer than either of the other two technologies. They're easier to mount, more durable, and can be broken down into convenient lengths for shipping. The first thing customers notice with magnetic scales is that the readhead and the scale are completely separate components. This means mounting magnetic scales is easier than any other type scale - since the readhead mounts separately from the scale, mounting is much quicker, and a whole lot easier! Prior to Electronica, magnetic scales were prohibitively expensive. Today, they are on par pricewise with optical scales. In summary, magnetic scales hold all the advantages of the other technologies, without retaining the negative qualities of being higher priced or difficult to install that inductive scales suffer from.

Picture of a New Glass Scale:

Picture of a new glass scale. Notice the mirror finish along the walls inside the scale.


Picture of a Glass Scale that's been improperly used in a contaminated environment:

Picture of a glass scale contaminated by hundreds of debris particles after being placed in service less than 3 months. The inside of this scale should be a mirror shiny finish, as shown above. Even a single bit of debris can cause a glass scale to stop reading correctly. Unfortunately, a contaminated glass scale will continue to display position, albeit an incorrect one, leaving the operator unaware of the malfunction. The solution, of course, is to use magnetic scales. Magnetic scales are designed to operate in the harshest and most extreme environments. Not only are magnetic scales unaffected by debris or contamination, they're also protected against submersion in coolant or liquids.




The height or head dimension of the readhead is critical to a clean DRO installation. Magnetic scale technology eliminates the bulky optical sensors common to traditional readheads.

A slim design means the readhead can be mounted close to the machine, increasing travel and tool efficiency.

Slimmer profile readheads are also much less likely to get damaged from dropped tools or workpieces.

Magnetic readheads retain the advantage of being impervious to coolant, but aren't bulky or expensive like inductive or optical scales.




The overall required mounting height is much less than optical or inductive scales.


Magnetic scale height is less than half that of inductive scales.



"Required End Clearance" is the 'dead space' between the center of the readhead and the end of the scale. The more "Required End Clearance" a scale requires, the longer the scale becomes.



What makes DRO PROS readouts the best? Am I really getting a good deal?

At DRO PROS we get daily emails from suppliers wanting us to hawk their digital readouts. We literally travel worldwide to seek out the best deals for you, our customer. International Trade Show in Beijing? Been there. Taiwan, Korea, Japan, China, you name it, we've been there. And guess what? Our selection of digital readouts represents the finest we've found. Anywhere. Trust us when we say you get what you pay for. We could choose to sell the same DRO's you see on eBay for $50 less, but we choose not to, because we know they won't last and ultimately will cause us and our customers frustration. Still don't believe us? Take a look here at the insides of a very popular DRO currently sold on eBay under various brand names:


 Poor quality connection found on "El Cheapo" ebay 'deal'      Poor quality connection found on "El Cheapo" ebay 'deal'  

(Click on images to enlarge)


Notice how the traces between the touch pads are simply taped in place by hand from leftover scraps - obviously this is much cheaper to manufacture, but how do you suppose this type of display is going to hold up on your machine? As they say, Caveat Emptor or 'Buyer Beware'.


Hopefully this information will help you, our Customer, when choosing your DRO system. Take your time, choose wisely.


What can a DRO do for me?

A digital readout system digitally displays a machine tool's exact position on an electronic display board. A DRO can greatly simplify your work, save time, reduce costly mistakes and allow you to produce more accurate, exacting parts. The DRO unit keeps precise track of tool bit position in all 3 axis - back and forth (x axis), fore and aft (y axis), and up and down (z axis). Without a DRO system, an operator must count the number of hand wheel revolutions to determine exact position of a tool head against the table. For example, some milling machine leadscrews are graduated at 16 threads per inch (TPI), which means that for every turn of the hand wheel the table moves 1/16? (.0625), therefore it takes 16 turns to move the table exactly 1?. Other machines are calibrated at 10 TPI, meaning it takes 10 hand wheel revolutions for the table to travel an inch. On the Z axis, it is typical for each division to represent .002?, where one full revolution is equal to .060?. Needless to say, it can quickly become quite confusing! The bottom line is that with a digital display, the days of counting hand wheel revolutions are over!


In summary, a machine equipped with a digital readout (DRO) is easier to use, less frustrating, and can save the operator many hours in setup and operation time. No more counting turns of the dial - simply turn the display on and you're ready to go - the DRO keeps track of position even after a power shortage!



Why should you buy from DRO PROS?

We speak English - We answer our phones - Same day shipping

Veteran owned, Veteran managed - and proud of it!


Our goal is to make customers for life. We feel that, in the long run, treating customers right will yield much more than simply "going for the sale". In accordance with that, we have attempted to pass on some ideas to help you, the customer, in completing your purchase decision:


Price. Probably the most talked about factor when buying a digital readout. Price can also be the most misleading, and perhaps worst way, to judge a digital readout kit. We've all heard the old adage, "You get what you pay for." Before the internet, it was true, price did generally correlate directly to value. But that was yesterdays economy. All resellers obtained their goods the same way, and therefore incurred the same costs. In today's economy, the market has changed drastically. At DRO PROS, we import and sell directly to you. Unlike our competitors, we do not have Western and Eastern sales divisions and multi layers of management to support. One location, one cost, and the savings get passed on to you!


Intuitiveness or "Ease of Use". Probably the most important, and hardest to determine factor when buying a readout. Think in terms of after the sale. Even if you get an absolute 'rock star' bottom line price that would make William Shatner proud, if the digital readout is not user friendly, you still didn't get a 'deal'. The whole point of getting a digital readout is to make your work easier and more enjoyable. If the digital readout is poorly designed, too complicated, if the display isn't bright enough, or in other words is 'user unfriendly', you'll regret your purchase decision every time you turn it on. It simply won't matter what you paid, it's not worth it!


Support. Most likely the second most important, and perhaps most overlooked factor when buying a digital readout. Imagine trying to reach a technician when you've bought a digital readout from an overseas reseller! Yet every day, people "save" $50 and buy products on eBay without stopping to think what will happen when they need service or tech support. Some digital readout resellers don't even publish a phone number! While our competitors continue to pare down or even totally eliminate their customer support, we continue to expand our Customer Service. Our Video Tutorials are the best in the industry, and are available free for you, our customers. Our tech help is the best in the business - our techs all know our readouts inside and out. Nobody knows digital readouts like DRO PROS!


Warranty. DRO PROS is proud to offer the industries safest, longest, lifetime warranty on all of our Electronica magnetic scale kits. DRO PROS brand warranty claims are handled directly by DRO PROS. No run-arounds, no hassle! Something not working as expected? Call us, don't get redirected overseas like the other guys!


Parts. Can you believe some resellers don't carry parts? That's right, buy from the "other guys", break a scale, and you get to replace the entire digital readout kit! Don't assume you can just go buy a different brand scale, either, because most manufacturers use different connectors on their scales. If that wasn't enough, even among those with a common connector, such as a DB9, most are hard wired differently. Finally, don't overlook the cost of parts. At DRO PROS, an 800mm replacement scale will cost you $197. A similar scale sold extensively by a European company will cost nearly $700! Finally, we have a massive inventory of parts, so rest easy - a replacement part is only a phone call away!


The Best Value. We literally search world-wide for the best value digital readout products on the planet. If there was a better digital readout package to be sold, we would be selling it. Yes, we've seen cheaper units on eBay, but there is a reason they're cheaper. Think poor quality, no parts, no manual, non-existent customer service, poor product fit/finish etc.


Customer Service. We pledge to never "over sell" you on a product that won't work well for you. Our philosophy is to try and save you money and get the best value kit tailored to the machinery you have. Many of our customers are surprised when we recommend against buying a more expensive brand. Again, our philosophy is to build customers for life. Give us a call and let us save you money!


Shipping. Most orders ship the same day, the next at the latest. We do not 'drop' ship, we have our own massive warehouse of inventory right here on site. We use UPS, you'll get a tracking number emailed to you immediately, and we cover all shipping insurance automatically.


The Company. DRO PROS is a veteran owned, American company. We enjoy selling quality products at competitive prices. We believe that  providing the best customer service is the key to success. No other company spends more time on the phone with customers than we do. Even in a down economy, our company continues to thrive and grow. We look forward to earning your business! 


The Bottom Line. Our line of digital readout's are simply the most user friendly readouts on the planet. Because of our direct marketing structure, they're also extremely affordable. Coupled with our extensive customer service and affordable parts, our Digital Readout products are simply the best value on the planet.




Domestic Shipping to the United States: All digital readout shipping is done via UPS for a flat rate of $43. You'll get a tracking number emailed direct to you from UPS, enabling you to track your shipment door to door! We cover insurance against any potential shipping damages, so no hidden fees here!


International Shipping to Canada: All of our DRO shipping is done via UPS. We charge a flat fee of $80.


International Shipping elsewhere: All of our DRO shipping is done via the United States Postal Service via a flat rate of $140.


Industry Leading Unlimited Lifetime Warranty

Electronica magnetic kits = Unlimited Lifetime Warranty

DRO PROS brand warranty claims are handled directly by DRO PROS.

No run-arounds, no hassle!


At DRO PROS, we take care of our customers. Have an issue or need some help? Let us take care of it with a toll-free call to California!


Call us now at 1-707-452-8434


We accept credit cards, checks and money order for payment



Call us now at 1-707-452-8434 for all your digital readout needs!



4992 Allison Parkway Suite G

Vacaville, CA 95688 US

Phone: 707-452-8434



(707) 452-8434     (707) 452-8437     (877) 628-6028

Our Kit and Part Prices always beat Heidenhain Newall Acurite Sargon & Fagor!


Unlimited Lifetime Warranty on Magnetic DRO Kits